首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   12231篇
  免费   1323篇
  国内免费   20篇
耳鼻咽喉   101篇
儿科学   342篇
妇产科学   314篇
基础医学   1841篇
口腔科学   257篇
临床医学   1424篇
内科学   2200篇
皮肤病学   139篇
神经病学   1284篇
特种医学   413篇
外国民族医学   1篇
外科学   1844篇
综合类   194篇
一般理论   6篇
预防医学   1264篇
眼科学   197篇
药学   822篇
中国医学   21篇
肿瘤学   910篇
  2022年   81篇
  2021年   212篇
  2020年   125篇
  2019年   197篇
  2018年   219篇
  2017年   177篇
  2016年   172篇
  2015年   241篇
  2014年   320篇
  2013年   448篇
  2012年   672篇
  2011年   624篇
  2010年   323篇
  2009年   335篇
  2008年   586篇
  2007年   525篇
  2006年   560篇
  2005年   550篇
  2004年   511篇
  2003年   488篇
  2002年   438篇
  2001年   360篇
  2000年   389篇
  1999年   339篇
  1998年   133篇
  1997年   126篇
  1996年   120篇
  1995年   105篇
  1994年   104篇
  1993年   87篇
  1992年   259篇
  1991年   230篇
  1990年   257篇
  1989年   252篇
  1988年   224篇
  1987年   215篇
  1986年   209篇
  1985年   221篇
  1984年   172篇
  1983年   140篇
  1982年   131篇
  1981年   102篇
  1980年   94篇
  1979年   149篇
  1978年   130篇
  1977年   97篇
  1976年   99篇
  1974年   106篇
  1973年   113篇
  1970年   81篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.

Background

The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.

Methods

A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.

Results

Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.

Conclusions

In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler.  相似文献   
4.
5.
6.
ObjectiveDetermine the prevalence of intimate partner violence (IPV) as a mechanism of traumatic ocular injury in women, typical injury patterns, and the clinical course of affected patients. Encourage IPV screening and safety assessment in patients presenting with characteristic ocular trauma.MethodsMedical records of 211 female patients with traumatic ocular injuries evaluated at the University of Iowa Hospitals and Clinics between January 1995 and January 2015 were reviewed to determine the rate of IPV as a mechanism of ocular trauma. Twenty-one patients were excluded due to no documented trauma.ResultsLeading causes of traumatic ocular injuries in the 190 female patients included were accidental trauma with an inanimate object (n = 70/190, 36.8%), falls (n = 52/190, 27.4%), motor vehicle collisions (n = 21/190, 11.1%), and assault (n = 16/190, 8.4%). In 2.1% of cases (n = 4/190), no mechanism of traumatic injury was documented. Assault was the fourth leading mechanism of injury accounting for 8.4% of cases (n = 16/190), with IPV accounting for more than one third of cases with a documented perpetrator (n = 5/13). No perpetrator was documented in 18.8% (n = 3/16). All 5 patients with IPV-related injuries sustained scleral laceration or rupture; 4 out of 5 patients had no light perception vision and ultimately required enucleation.ConclusionIPV is an important mechanism of traumatic ocular injury. IPV-associated injuries tend to be severe in nature, as demonstrated by the high rate of globe laceration or rupture and subsequent enucleation in the study population. By appropriate screening and referral, ophthalmologists have an opportunity to redirect a potentially devastating course.  相似文献   
7.
This paper introduces the ‘foot function’ approach used by podiatrists in the treatment of lower limb musculoskeletal dysfunction. The aim is to demonstrate how podiatric theory has evolved its own perspective of mechanisms relating to normal and abnormal locomotion. Three individual podiatric paradigms are discussed, and a further theory allowing a working simplification of theory is introduced. Finally, an example of gait abnormality is discussed in relation to podiatric and physiotherapy perspectives.An insight into podiatric theory should enable therapists working within this field to develop a more holistic and multidisciplinary approach. It is the view of the authors that a closer working relationship between physiotherapists and podiatrists with an interest in movement dysfunction provides a better quality service for appropriate patients.  相似文献   
8.
The treatment options of patients with urge incontinence are behavioral therapy, drug therapy and surgery. The evaluation and reported efficacy of these treatments, with particular reference to the potential placebo response in treatment is discussed.  相似文献   
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号